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Fig. 2.

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Comparison of CG4 properties with samples of compact quartets built from other published compact group catalogs, with the same selection in redshifts and magnitudes: 0.005≤zBGG≤0.0452, MBGG≤−21.81, and M4M1≤3. From top left to bottom right, the properties are median of the projected inter-galaxy separations, radial velocity dispersion, total group luminosity, group virial theorem mass, crossing time, mass-to-light ratio, BGG relative offset (normalized distance of the BGG to the centroid of the group), BGG relative velocity offset (normalized distance in radial velocity of the BGG to the group radial velocity dispersion, top-right panel), BGG luminosity fraction, and absolute magnitude difference between the two brightest galaxy members. The abscissa indicate the compact group catalogs: HCG: Hickson et al. (1992), D12: Díaz-Giménez et al. (2012), S16: Sohn et al. (2016), Z20: Zheng & Shen (2020), Z22: Zandivarez et al. (2022), D18: Díaz-Giménez et al. (2018), and CG4: this work.

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